How to pronounce “rub up” in English

as imperial powers were beginning to rub up against one another.

is it's ok to rub up against the person next to you, say "Chow," and continue on your way, all right?

We really engineer clothing so it doesn't rub up against you uncomfortably.

since then chronicling stories just like that places where truth and consequences collide rub up against each other and

and I'm kind of interested in what happens where these communities, economies, rub up against each other, in the sense that the people that you're

Yeah, I'll rub up against that technologically a little bit.